2 files changed, 2 insertions, 2 deletions
diff --git a/vendor/sabre/dav/lib/CardDAV/Backend/PDO.php b/vendor/sabre/dav/lib/CardDAV/Backend/PDO.php
index 966d7ba09..4ca9284a9 100644
--- a/vendor/sabre/dav/lib/CardDAV/Backend/PDO.php
+++ b/vendor/sabre/dav/lib/CardDAV/Backend/PDO.php
@@ -452,7 +452,7 @@ class PDO extends AbstractBackend implements SyncSupport
      * @param int    $syncLevel
      * @param int    $limit
      *
-     * @return array
+     * @return array|null
      */
     public function getChangesForAddressBook($addressBookId, $syncToken, $syncLevel, $limit = null)
     {
diff --git a/vendor/sabre/dav/lib/CardDAV/Backend/SyncSupport.php b/vendor/sabre/dav/lib/CardDAV/Backend/SyncSupport.php
index 071361ed0..6aaad1415 100644
--- a/vendor/sabre/dav/lib/CardDAV/Backend/SyncSupport.php
+++ b/vendor/sabre/dav/lib/CardDAV/Backend/SyncSupport.php
@@ -77,7 +77,7 @@ interface SyncSupport extends BackendInterface
      * @param int    $syncLevel
      * @param int    $limit
      *
-     * @return array
+     * @return array|null
      */
     public function getChangesForAddressBook($addressBookId, $syncToken, $syncLevel, $limit = null);
 }